Are these true images in css background loads before all images in HTML <img>?

Question

IF I want to quickly load any image if I don't use css as my background? I think that the difference will only show in the low-speed Internet connection.

I have seen many articles related to css preloading, they all use images in the background of css.

http://perishablepress.com/press/2008/04/15/pure-css-better-image-preloading-without-javascript/

http://perishablepress.com/press/2007/07/22/css-throwdown-preload-images-without-javascript/

http://divitodesign.com/css/create-an-image-pre-loader-with-css-only/

Answer 1

, . , css, , css, .

, .

... , . , , , . . css , , . , . , , .

Answer 2

. , , , . 200 CSS, .

- , "" .